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Refactor histograms in predictors.

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Replace the 2d histograms with uint32_t 1d versions (to avoid
pointer casting and to use the optimized VP8LAddVectorEq).

Change-Id: I90b0fe98390b49e3fd03e3484289571cf7ae6eca
This commit is contained in:
Vincent Rabaud
2024-05-03 22:09:38 +02:00
parent a7aa7525b8
commit a90160e11a
6 changed files with 90 additions and 97 deletions
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13
src/dsp/lossless_enc.c
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@ -400,14 +400,15 @@ static float FastLog2Slow_C(uint32_t v) {
// Methods to calculate Entropy (Shannon).
// Compute the combined Shanon's entropy for distribution {X} and {X+Y}
static float CombinedShannonEntropy_C(const int X[256], const int Y[256]) {
static float CombinedShannonEntropy_C(const uint32_t X[256],
const uint32_t Y[256]) {
int i;
float retval = 0.f;
int sumX = 0, sumXY = 0;
uint32_t sumX = 0, sumXY = 0;
for (i = 0; i < 256; ++i) {
const int x = X[i];
const uint32_t x = X[i];
if (x != 0) {
const int xy = x + Y[i];
const uint32_t xy = x + Y[i];
sumX += x;
retval -= VP8LFastSLog2(x);
sumXY += xy;
@ -577,7 +578,7 @@ static WEBP_INLINE uint8_t TransformColorBlue(uint8_t green_to_blue,
void VP8LCollectColorRedTransforms_C(const uint32_t* argb, int stride,
int tile_width, int tile_height,
int green_to_red, int histo[]) {
int green_to_red, uint32_t histo[]) {
while (tile_height-- > 0) {
int x;
for (x = 0; x < tile_width; ++x) {
@ -590,7 +591,7 @@ void VP8LCollectColorRedTransforms_C(const uint32_t* argb, int stride,
void VP8LCollectColorBlueTransforms_C(const uint32_t* argb, int stride,
int tile_width, int tile_height,
int green_to_blue, int red_to_blue,
int histo[]) {
uint32_t histo[]) {
while (tile_height-- > 0) {
int x;
for (x = 0; x < tile_width; ++x) {